With wild oyster reefs on a scary decline, farming oysters may be the only way to get them someday soon. Ocean acidification is wreaking havoc on these poor bivalves -- the acid makes it more difficult for them to grow their hard shells -- and it's too bad, because, like mussels, they can help filter the water, too.
Oyster farming can be done in relatively small areas of water, and it can be done in what amounts to a near closed-loop process, so farmed oysters remain a good choice for both ocean and human health. Try Emeril's Oysters Bienville or just crack 'em open and slurp off the half shell.
Photo credit: lsgcp via Flickr